Everything? Where's the electric cutoff that prevents dry fire? Where are new mags design that don't waste BBs when reloading? PTWs and the new Marui and KWA systems have had those for a while.

This is merely another split gearbox design that brings absolutely nothing new to the table.

This is 2013, why should we settle for a copy of an old ICS design?

Because it would represent a substantial improvement (in some ways) on G&G's current lineup without incurring the rather large switchover costs (both in fabrication and for customers existing equipment investments) to new magazines and a lot of other things. They are making a bet that an incremental improvement will be a good balance between new capital investments and convenience to customers.

To put your line another way: "This is 2013, copying and improving incrementally is good".